Analysis of the factors affecting the thickening response of phenyl-propylene latex paint additives.

modern construction is mainly concrete structure, because of its porous surface structure and its easy to absorb water characteristics make it vulnerable to external environmental erosion and damage. With the development of the construction industry, the use of paint to decorate the appearance of buildings to protect, more and more people's recognition. In China often use building latex paint to decorate the building protection. Especially in the building interior decoration, synthetic resin emulsion coating is widely used in interior decoration and decoration, its characteristics are beautiful decoration, construction is convenient.. 1 Test part 1.1 Experimental raw materials and instrumentspigments: titanium dioxide 2295: Shandong Daon titanium industry; phenyl propylene emulsion: domestic; dispersants: Gaotai, Dow; thickeners: Gaotai, Dow; film additive CLAUVIS FAN1, tank preservative BC 25: Guangdong Longhu Technology Co., Ltd. Experimental instruments and substrates: high-speed dispersion machine, Stommer viscosity meter: Guangzhou Standard Gerda Laboratory Instrument Supplies Co., Ltd.1.2 Test MethodExperiments are carried out on the basic formulation, a material is compared to test, other raw materials are the same case with the paint, the paint is prepared, under standard conditions for maintenance for 24 hours, viscosity testing.Basic Formula: 2 Test results and analysis 2.1 Effects of emulsions from different manufacturers on thickening response Emulsion, as the core raw material of latex paint, affects the alkaline and scrub resistance of coating. One of the main sources of viscosity of coatings is the viscosity formed by thickening the emulsion by thickening the emulsion. Experiment selected 3 companies of 3 products, product A, product B are well-known domestic emulsion manufacturers products, product C is a manufacturer's products. Individual product data such as Table 2.. In a watery emulsion, individual emulsion particles can be seen in the emulsion as being surrounded by emulsion sheaths. In addition, a certain amount of residual surfactants are present in the water phase. The emulsifying agent molecule has two parts, hydro-hydro and pro-oil. According to the characteristics of their hydro-water-kissed parts, they can be divided into three types. That is, negative ion emulsizer, positive ion emulsizer, non-ion emulsizer. The emulsion synthesis selected different emulsions directly affect the adsorption between the thickener hydrophobic group and the latex particles. As can be seen from Figure 1, the viscosity of the finished coating of emulsion A and B is significantly higher than that of the emulsion C, there are some differences in the viscosity of the finished coating prepared by each emulsion, the viscosity of different emulsions has obvious effect on the viscosity of the coating, and the difference between the viscosity of different emulsions needs to be tested for preparation of samples. The use of alkali-soluble thickener coating after heat storage have a certain post-thickening, viscosity changes in about 5%.. 2.2 Effect of dispersant on thickening response In latex paint formulation components, the main function of surfactants in latex paint is to wet pigment fillers and keep them evenly dispersed, to improve the luster, cover and color display properties of the paint film, and to wet the substrate. The experiment selected different manufacturers of dispersants for comparative testing, each product data such as Table 3.the structure ofdispersants has two parts: one is the pigment affinity group, such as carboxing, mesothyl acid/alkali, non-ion base group, etc., and the other is affinity group with the system, such as acrylates, polyurethanes, polyethers, polyesters, alkyl. The dispersants selected for the experimental test were polyacrylic pyrenates. Dispersants have a reduced viscosity effect on coatings, helping to moisten the pigment filler dispersion process, reducing the viscosity of the slurry makes dispersion easy, and makes the dispersed particles suspended steadily in the liquid. Pigment particles are different in chemistry than surface and surface, and the dispersion of dispersants can vary. From Figure 2, it can be seen that the finished viscosity of the finished coating prepared by Gautai dispersant is lower, the effect of reducing viscosity of the coating is better, and the high-speed dispersion phase of the coating is more suitable for the dispersion of pigment fillers, followed by Dow and St. Nopko.. 2.3 Differences in thickening response of different joint-type alkali-soluble thickeners to the same emulsion Latex paint is water-based solvent, viscosity is very low, can not meet the requirements of the coating, generally need to add thickeners to regulate fluid denaturation. In the inner wall latex paint formula thickening system is generally to contract-type alkali-soluble thickener experimental selection of alkali-soluble thickener thickener to provide medium-cut viscosity type thickener, each product data such as Table 4.. Latex paint without thickeners is difficult to meet storage, transportation and construction requirements due to its thinning. This requires the addition of thickeners to adjust the viscosity of the coating. Latex paint of the same emulsion, adding different manufacturers of the alkali-soluble thickening thickener, emulsion thickening response is obviously different, there is a significant difference in thickening efficiency, which is due to thickener polymer hydrophobic chain and latex particles, surfactants, pigment particles and other hydrophobic parts of the connectivity performance differences resulting in different thickening efficiency. Alkaline-soluble thickener and emulsion responsive alkali-soluble thickener can reduce the amount of thickener and improve the water resistance of the coating. From Figure 3, it can be seen that the finished viscosity of the coating prepared by Gaotai's different thickeners is relatively high, and the thickening match is better. Dow and St. Knopko each have one product thickening match better, the other product next.. 3 Conclusions , paint viscosity factors have many, in the formulation development needs to be properly matched with each component. First of all, we should select the thickening responsiveness of the lotion to test, select the better responsive products. Secondly, it is possible to reasonably match the dispersant, and select the dispersant with high dispersion efficiency can not only reduce the amount of added to improve viscosity, but also reduce the amount of added surfactant to improve the performance of the paint film. After selecting a good emulsion, then select a better matching alkali-soluble thickener, which can reduce the amount of alkali-soluble thickener and improve the water resistance of the paint film..